A Robeast is a Kaiju-sized monster, more often than not the same size as the Super Robot that battles it, though Robeasts in Sentai and Toku may also start in human size, so as to be a threat on a personal scale, then grows through some form of Applied Phlebotinum.

Robeasts are rarely capable of human-level intelligence or communication, and even when they are, they usually prefer to just roar instead.

Robeasts are usually built with both biological and mechanical construction (though some are also completely mechanical, magical constructs, giant demons, and the like). They come in a dizzying variety of shapes, abilities, and weapons, and very rarely will any two robeasts look alike, even between robeasts deployed by the same villain(s). Many of them avoid humanoid designs and mook status, becoming a Mechanical Monster.

The Angels from Neon Genesis Evangelion are an interesting example. At first, they're made out to be gigantic monsters. Then we find out that they are humans as humans could have been had they evolved differently.

The original form of Mechagodzilla from Godzilla franchise. The second version was a human piloted mecha. The third version was a human piloted mecha built on the bones of the original Godzilla, dubbed Kiryu. Kiryu went berserk in its first confrontation with (a second) Godzilla, playing with the trope.

Reapers from Mass Effect are what happens when a whole army of Robeasts invade the galaxy and there are noSuper Robots to save the day.

Western Animation

South Park — In the Sentai parody episode, Barbara Streisand turned into a Mechagodzilla.

And returned in "201" with full sentience.

Parodied in one episode of 'The Grim Adventures of Billy & Mandy'' where Grim takes Billy (who has been transformed into a 50-foot superhero) to Tokyo to meet a spoof of Gidora. An angry Mandy pilotes a giant gorilla robot called Mega-gorillasaur to bring them back.

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